package com.linewell.controller;

import com.linewell.one.NameComparator;
import com.linewell.one.SizeComparator;
import com.linewell.one.TypeComparator;
import com.linewell.utils.Msg;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.json.simple.JSONObject;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * @Title: ssm2
 * @description:
 * @author: hyuhuang@linewell.com
 * @since:2018/3/15
 */
@Controller
public class ImageLoadUpController {

    /**
     * @descripition  上传图片到数据
     * @author hyuhuang@linewell.com
     * @date 2018/2/27 10:32
     * @param request, response, dir
     * @return org.json.simple.JSONObject
     */
    @RequestMapping("/imageUpload")
    @ResponseBody
    public JSONObject imageUpload(HttpServletRequest request, HttpServletResponse response, String dir) throws Exception{

        ServletContext application = request.getSession().getServletContext();
        String savePath = application.getRealPath("/upload/") ;

        // 文件保存目录URL
        String saveUrl = request.getContextPath() + "/upload/";

        // 定义允许上传的文件扩展名
        HashMap<String, String> extMap = new HashMap<String, String>();
        extMap.put("image", "gif,jpg,jpeg,png,bmp");
        extMap.put("flash", "swf,flv");
        extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
        extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

        // 最大文件大小
        long maxSize = 10000000;

        response.reset();
        response.setContentType("text/html; charset=UTF-8");


        if (!ServletFileUpload.isMultipartContent(request)) {
            return getError("请选择文件。");

        }
        // 检查目录
        File uploadDir = new File(savePath);
        if (!uploadDir.isDirectory()) {
            return getError("上传目录不存在。");
        }
        // 检查目录写权限
        if (!uploadDir.canWrite()) {
            return getError("上传目录没有写权限。");
        }

        String dirName = dir;
        if (dirName == null) {
            dirName = "image";
        }
        if (!extMap.containsKey(dirName)) {
            return getError("目录名不正确。");
        }
        // 创建文件夹
        savePath += dirName + "/";
        saveUrl += dirName + "/";
        File saveDirFile = new File(savePath);
        if (!saveDirFile.exists()) {
            saveDirFile.mkdirs();
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        String ymd = sdf.format(new Date());
        savePath += ymd + "/";
        saveUrl += ymd + "/";
        File dirFile = new File(savePath);
        if (!dirFile.exists()) {
            dirFile.mkdirs();
        }

        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setHeaderEncoding("UTF-8");
        List items = upload.parseRequest(request);
        Iterator itr = items.iterator();
        while (itr.hasNext()) {
            FileItem item = (FileItem) itr.next();
            String fileName = item.getName();
            if (!item.isFormField()) {
                // 检查文件大小
                if (item.getSize() > maxSize) {
                    return getError("上传文件大小超过限制。");
                }
                // 检查扩展名
                String fileExt = fileName.substring(
                        fileName.lastIndexOf(".") + 1).toLowerCase();
                if (!Arrays.<String> asList(extMap.get(dirName).split(","))
                        .contains(fileExt)) {
                    return getError("上传文件扩展名是不允许的扩展名。\n只允许"+ extMap.get(dirName) + "格式。");
                }

                SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
                String newFileName = df.format(new Date()) + "_"
                        + new Random().nextInt(1000) + "." + fileExt;
                try {
                    File uploadedFile = new File(savePath, newFileName);
                    item.write(uploadedFile);
                } catch (Exception e) {
                    return getError("上传文件失败。");
                }
                JSONObject obj = new JSONObject();
                obj.put("error", 0);
                obj.put("url", saveUrl + newFileName);
                return obj;
            }
        }
        return null;
    }

    @RequestMapping("/fileManager")
    @ResponseBody
    public Msg fileManager(HttpServletRequest request,HttpServletResponse response){

        //根目录路径，可以指定绝对路径，比如 /var/www/attached/
        String rootPath = request.getServletContext().getRealPath("/") + "upload/";
        //根目录URL，可以指定绝对路径，比如 http://www.yoursite.com/attached/
        String rootUrl  = request.getContextPath() + "/upload/";
        //图片扩展名
        String[] fileTypes = new String[]{"gif", "jpg", "jpeg", "png", "bmp"};

        String dirName = request.getParameter("dir");
        if (dirName != null) {
            if(!Arrays.<String>asList(new String[]{"image", "flash", "media", "file"}).contains(dirName)){
                return Msg.fail().add("data","Invalid Directory name.");
            }
            rootPath += dirName + "/";
            rootUrl += dirName + "/";
            File saveDirFile = new File(rootPath);
            if (!saveDirFile.exists()) {
                saveDirFile.mkdirs();
            }
        }
        //根据path参数，设置各路径和URL
        String path = request.getParameter("path") != null ? request.getParameter("path") : "";
        String currentPath = rootPath + path;
        String currentUrl = rootUrl + path;
        String currentDirPath = path;
        String moveupDirPath = "";
        if (!"".equals(path)) {
            String str = currentDirPath.substring(0, currentDirPath.length() - 1);
            moveupDirPath = str.lastIndexOf("/") >= 0 ? str.substring(0, str.lastIndexOf("/") + 1) : "";
        }

        //排序形式，name or size or type
        String order = request.getParameter("order") != null ? request.getParameter("order").toLowerCase() : "name";

        //不允许使用..移动到上一级目录
        if (path.indexOf("..") >= 0) {
            return Msg.fail().add("data","Access is not allowed.");
        }
        //最后一个字符不是/
        if (!"".equals(path) && !path.endsWith("/")) {
            return Msg.fail().add("data","Parameter is not valid.");
        }
        //目录不存在或不是目录
        File currentPathFile = new File(currentPath);
        if(!currentPathFile.isDirectory()){
            return Msg.fail().add("data","Directory does not exist.");
        }

        //遍历目录取的文件信息
        List<Hashtable> fileList = new ArrayList<Hashtable>();
        if(currentPathFile.listFiles() != null) {
            for (File file : currentPathFile.listFiles()) {
                Hashtable<String, Object> hash = new Hashtable<String, Object>();
                String fileName = file.getName();
                if(file.isDirectory()) {
                    hash.put("is_dir", true);
                    hash.put("has_file", (file.listFiles() != null));
                    hash.put("filesize", 0L);
                    hash.put("is_photo", false);
                    hash.put("filetype", "");
                } else if(file.isFile()){
                    String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                    hash.put("is_dir", false);
                    hash.put("has_file", false);
                    hash.put("filesize", file.length());
                    hash.put("is_photo", Arrays.<String>asList(fileTypes).contains(fileExt));
                    hash.put("filetype", fileExt);
                }
                hash.put("filename", fileName);
                hash.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
                fileList.add(hash);
            }
        }

        if ("size".equals(order)) {
            Collections.sort(fileList, new SizeComparator());
        } else if ("type".equals(order)) {
            Collections.sort(fileList, new TypeComparator());
        } else {
            Collections.sort(fileList, new NameComparator());
        }

        Msg.success().add("moveup_dir_path", moveupDirPath);
        Msg.success().add("current_dir_path", currentDirPath);
        Msg.success().add("current_url", currentUrl);
        Msg.success().add("total_count", fileList.size());
        Msg.success().add("file_list", fileList);
        response.setContentType("application/json; charset=UTF-8");
        return Msg.success();
    }

    private JSONObject getError(String message) {
        JSONObject obj = new JSONObject();
        obj.put("error", 1);
        obj.put("message", message);
        return obj;
    }
}
